refactor: formal ChainScanner adapter contract for third-party chains…

[kodinaka30-ship-it]

Closes (#176)

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#176	Formal ChainScanner adapter contract for third-party chains	Link to this issue

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[truthixify]

Thanks @kodinaka30-ship-it. All four examples jobs fail for one reason, and it is a dropped import rather than anything to do with the adapter design:

src/chains/stellar/scan.ts(95,29): error TS2552: Cannot find name 'hexToBytes'.

Also at lines 99, 417 and 421. develop has this at the top of scan.ts:

import { hexToBytes } from './utils';

The refactor removed it while the four call sites are still there, so the dts build fails for every example. Re-add the import and it should clear all four jobs at once.

Worth noting TypeScript's suggestion in that error, "Did you mean HEX_TO_BYTE?", is a red herring. That is the local lookup table further down the file, not the function you want.